Wakeboarding

The participant is towed on a small board riding a wake produced by the towing boat, and attempts to do tricks. Events are organized by the World Wakeboarding Association. A special wakeboarding boat has a wakeboard tower, which places pull point higher above water's surface which makes it easier to jump. Wakeboarding boats have a ballast system that pumps water into tanks to increase displacement, and enlarge the wake. Source : https://en.wikipedia.org/wiki/List_of_surface_water_sports#Wakeboarding